Cleaning Aluminum Cookware

I have a 13 X 9 inch aluminum baking pan. I baked a chicken in it with water underneath the plastic baking bag. It left dark gray water marks on the bottom of my shiny pan. Is there any hope I can remove this?

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I have used cream of tartar, lemon juice, and vinegar so far. Anyone have an idea how I can get the pan back to shiny again? Any help will be appreciated. Thank you.